It's crazy, but I have 4 males and one female Bartletts and I think the 2 dispars are both males, I'm not sure about them. I bought all of them at the same time and they all came in to the LFS at the same time , so I think thats how I get away with it. The only time the Bartletts get a little frisky is when the female comes out. I added my larger fish last, so my purple tang hasn't been bad.